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-rw-r--r--src/GsWidget.cxx266
1 files changed, 216 insertions, 50 deletions
diff --git a/src/GsWidget.cxx b/src/GsWidget.cxx
index 1bb2e53..e92a71d 100644
--- a/src/GsWidget.cxx
+++ b/src/GsWidget.cxx
@@ -29,11 +29,14 @@
#include <errno.h>
#include <sys/wait.h>
#include <fcntl.h>
+#include <signal.h>
#include <FL/fl_draw.H>
#include "GsWidget.H"
+#include "PostscriptDSC.H"
+#define MIN(A,B) ((A)<(B)?(A):(B))
void GsWidget::draw() {
if (!offscreen) {
@@ -66,7 +69,7 @@ void GsWidget::setProps() {
atoms[3] = XInternAtom(fl_display,"PAGE" , false);
atoms[4] = XInternAtom(fl_display,"DONE" , false);
- snprintf(data, 512, "%d %d %d %d %d %d %d.0 %d.0",
+ snprintf(data, sizeof(data), "%d %d %d %d %d %d %d.0 %d.0",
0, 0, 0, 0, paper_x, paper_y, xdpi, ydpi);
int xid = fl_xid(window());
@@ -75,7 +78,7 @@ void GsWidget::setProps() {
XA_STRING, 8, PropModeReplace,
(unsigned char*) data, strlen(data));
- snprintf(data, 512, "%s %d %d", "Color",
+ snprintf(data, sizeof(data), "%s %d %d", "Color",
(int) BlackPixel(fl_display, DefaultScreen(fl_display)),
(int) WhitePixel(fl_display, DefaultScreen(fl_display)));
@@ -111,6 +114,8 @@ GsWidget::GsWidget(int X,int Y,int W, int H) : Fl_Widget(X, Y, W, H) {
initial_height = H;
in_fd = -1;
reload_needed = 0;
+ dsc = NULL;
+ feeding = 0;
}
GsWidget::~GsWidget() {
@@ -120,22 +125,58 @@ GsWidget::~GsWidget() {
}
}
-int GsWidget::load(char *f) {
+int GsWidget::open_file(char *f) {
int fd = open(f, O_RDONLY);
if (fd == -1) {
perror("open");
return 1;
}
- return load(fd);
+ return open_file(fd);
}
-int GsWidget::load(int fd) {
+int GsWidget::open_file(int fd) {
if (in_fd >= 0 && fd != in_fd) {
close (in_fd);
}
-
in_fd = fd;
+ if (dsc) {
+ delete(dsc);
+ }
+ dsc = new PostscriptDSC();
+
+ if (dsc->parse(in_fd) == 0) {
+ int bb_x, bb_y, bb_w, bb_h;
+
+ dsc->get_bounding_box(&bb_x, &bb_y, &bb_w, &bb_h);
+ paper_x = bb_w;
+ paper_y = bb_h;
+ } else {
+ delete(dsc);
+ dsc = NULL;
+ paper_x = 594; // DIN A4
+ paper_y = 841; //
+ }
+
+ page = 0;
+
+ return 0;
+}
+
+
+int GsWidget::load() {
+ pid_t pid;
+
+ if (dsc) {
+ return load_page(1);
+ }
+
+ if (in_fd < 0) {
+ return 1;
+ }
+
+ lseek(in_fd, 0L, SEEK_SET);
+
fl_cursor(FL_CURSOR_WAIT);
kill_gs();
@@ -146,48 +187,145 @@ int GsWidget::load(int fd) {
setProps();
- pid_t pid = fork();
+ pid = fork();
if (pid == (pid_t) 0) {
- char *argv[16];
- char gvenv[256];
- int d_null = open("/dev/null", O_WRONLY);
-
- dup2(d_null, STDOUT_FILENO);
- close(d_null);
dup2(in_fd, STDIN_FILENO);
- snprintf(gvenv, 256, "%d %d", (int) fl_xid(window()), (int) offscreen);
-
- setenv("GHOSTVIEW", gvenv, 1);
- argv[0] = "gs";
- argv[1] = "-dSAFER";
- argv[2] = "-dQUIET";
- argv[3] = "-sDEVICE=x11alpha";
- argv[4] = "-dNOPLATFONTS";
- argv[5] = "-";
- argv[6] = NULL;
- execvp(argv[0], argv);
- perror("exec");
- fprintf(stderr, "Please install ghostscript and make sure 'gs' "
- "is in the PATH.\n");
- exit(1);
+ exec_gs();
} else {
gs_pid = pid;
- page = 0;
+ page = 1;
}
return 0;
}
+int
+GsWidget::load_page(int p) {
+ pid_t pid;
+ int pdes[2];
+
+ if (feeding || in_fd < 0) {
+ return 1;
+ }
+
+ if (p < 1 || p > dsc->get_pages()) {
+ fprintf(stderr, "Page %d not found in document\n", p);
+ return 1;
+ }
+
+ fl_cursor(FL_CURSOR_WAIT);
+ kill_gs();
+
+ page = p;
+
+ if (!offscreen) {
+ reload_needed = 1;
+ return 0;
+ }
+
+ if (pipe(pdes) < 0) {
+ perror("pipe");
+ return 1;
+ }
+
+ feeding = 1;
+
+ lseek(in_fd, 0L, SEEK_SET);
+ setProps();
+
+ pid = fork();
+ if (pid == (pid_t) 0) {
+ close(in_fd);
+ close(pdes[1]);
+ dup2(pdes[0], STDIN_FILENO);
+ exec_gs();
+ } else {
+ size_t len;
+
+ gs_pid = pid;
+
+ close(pdes[0]);
+
+ lseek(in_fd, 0L, SEEK_SET);
+ len = dsc->get_setup_len();
+ if (fd_copy(pdes[1], in_fd, len) != 0) {
+ close(pdes[1]);
+ feeding = 0;
+ return 1;
+ }
+
+ lseek(in_fd, dsc->get_page_off(p), SEEK_SET);
+ len = dsc->get_page_len(p);
+ if (fd_copy(pdes[1], in_fd, len) != 0) {
+ close(pdes[1]);
+ feeding = 0;
+ return 1;
+ }
+
+ close(pdes[1]);
+ }
+
+ feeding = 0;
+ return 0;
+}
+
+int GsWidget::fd_copy(int to, int from, size_t len) {
+ size_t n, r;
+ char buf[1024];
+
+ n = 0;
+ while(len > 0) {
+ Fl::check(); // let fltk do its stuff - otherwise
+ // gs can't get the GHOSTVIEW property
+ r = read(from, buf, MIN(sizeof(buf), len));
+
+ if (r < 0) {
+ perror("read");
+ return 1;
+ }
+
+ write(to, buf, r);
+ len -= r;
+ }
+
+ return 0;
+}
+
+void GsWidget::exec_gs() {
+ char *argv[16];
+ char gvenv[256];
+ int d_null = open("/dev/null", O_WRONLY);
+
+ dup2(d_null, STDOUT_FILENO);
+
+ snprintf(gvenv, sizeof(gvenv), "%d %d",
+ (int) fl_xid(window()), (int) offscreen);
+
+ setenv("GHOSTVIEW", gvenv, 1);
+ argv[0] = "gs";
+ argv[1] = "-dSAFER";
+ argv[2] = "-dQUIET";
+ argv[3] = "-sDEVICE=x11alpha";
+ argv[4] = "-dNOPLATFONTS";
+ argv[5] = "-dNOPAUSE";
+ argv[6] = "-";
+ argv[7] = NULL;
+ execvp(argv[0], argv);
+ perror("exec");
+ fprintf(stderr, "Please install ghostscript and make sure 'gs' "
+ "is in the PATH.\n");
+ exit(1);
+}
+
int GsWidget::reload() {
int ret;
if (in_fd >= 0) {
- ret = lseek(in_fd, 0L, SEEK_SET);
- if (ret == -1) {
- perror("lseek");
- return 1;
+ if (dsc) {
+ load_page(page);
+ } else {
+ load();
}
- load(in_fd);
return 0;
} else {
return 1;
@@ -195,35 +333,54 @@ int GsWidget::reload() {
}
int GsWidget::next() {
- if (!gs_active()) {
- return 1;
+ if (dsc) {
+ load_page(page + 1);
} else {
- fl_cursor(FL_CURSOR_WAIT);
-
- XEvent e;
- e.xclient.type = ClientMessage;
- e.xclient.display = fl_display;
- e.xclient.window = gs_win;
- e.xclient.message_type = atoms[2];
- e.xclient.format = 32;
-
- XSendEvent(fl_display, gs_win, false, 0, &e);
- XFlush(fl_display);
+ if (!gs_active()) {
+ return 1;
+ } else {
+ fl_cursor(FL_CURSOR_WAIT);
+
+ XEvent e;
+ e.xclient.type = ClientMessage;
+ e.xclient.display = fl_display;
+ e.xclient.window = gs_win;
+ e.xclient.message_type = atoms[2];
+ e.xclient.format = 32;
+
+ XSendEvent(fl_display, gs_win, false, 0, &e);
+ XFlush(fl_display);
+ }
}
return 0;
}
+int GsWidget::prev() {
+ if (dsc) {
+ load_page(page - 1);
+ return 0;
+ } else {
+ return 1;
+ }
+}
+
int GsWidget::handleX11(int ev) {
if (fl_xevent->type == ClientMessage) {
gs_win = fl_xevent->xclient.data.l[0];
- if(fl_xevent->xclient.message_type == atoms[3]) {
- page++; // PAGE revceived
+ if(fl_xevent->xclient.message_type == atoms[3]) { // PAGE received
damage(FL_DAMAGE_ALL);
fl_cursor(FL_CURSOR_DEFAULT);
+ if (dsc) {
+ kill_gs();
+ } else {
+ page++;
+ }
} else if(fl_xevent->xclient.message_type == atoms[4] ) {
- reload(); // go back to page 1
+ if (!dsc) {
+ reload(); // go back to page 1
+ }
}
return 1;
}
@@ -260,3 +417,12 @@ int GsWidget::zoom(int p) {
return 0;
}
+
+int
+GsWidget::get_pages() {
+ if (dsc) {
+ return dsc->get_pages();
+ } else {
+ return 0;
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-28 01:22:34 +0000